Re: [PATCH v2 01/25] irqdomain: Add firmware info reporting interface
From: Jonathan Cameron <jonathan.cameron@huawei.com>
Date: 2025-09-16 15:14:43
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linux-acpi, lkml
On Mon, 15 Sep 2025 09:56:38 +0100 Marc Zyngier [off-list ref] wrote:
Allow an irqdomain callback to report firmware-provided information that is otherwise not available in a generic way. This is reported using a new data structure (struct irq_fwspec_info). This callback is optional and the only information that can be reported currently is the affinity of an interrupt. However, the containing structure is designed to be extensible, allowing other potentially relevant information to be reported in the future. Signed-off-by: Marc Zyngier <maz@kernel.org>
Hi Marc,
quoted hunk ↗ jump to hunk
--- include/linux/irqdomain.h | 28 ++++++++++++++++++++++++++++ kernel/irq/irqdomain.c | 32 +++++++++++++++++++++++++++----- 2 files changed, 55 insertions(+), 5 deletions(-)diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 4a86e6b915dd6..34993bf8293c4 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h@@ -44,6 +44,24 @@ struct irq_fwspec { u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS]; }; +/** + * struct irq_fwspec_info - firmware provided IRQ information structure + * + * @fwspec: Firmware-specific interrupt specifier
Not aligning with what is in the structure that I can see.
+ * @cpumask: Affinity mask for this interrupt
+ * @flags: Information validity flags
+ *
+ * This structure reports firmware-specific information about an
+ * interrupt. The only significant information is the affinity of a
+ * per-CPU interrupt, but this is designed to be extended as required.
+ */
+struct irq_fwspec_info {
+ unsigned long flags;
+ const struct cpumask *affinity;
+};